Blue vat dye.



UNITED STATES PATENT OFFICE WILHELM BAUER. OF VOHWINKEL, NEAR ELBERFELD. AND ALIBID 113m 0! ELBERFELD. GERMANY. ASSIGNORS T0 FARBENI-ABRIKEN VORK. IRIBDI. BL! & 60., 0F ELBEBFELD, GERMANY. A CORPORATION OF OEBHANY.

BLUE VAT DYE.

Io Drawing.

Specification of Letters Patent.

Application flied January 1!, i810. Serial 80. 537,72.

Patented May 1'7, 1910.

specificat ion.

()ttr invention relates to the natnufacture and production of new and valuable vat d \'e.-tutl's. They are obtained by condensing substituted isatiu derivatives eontainin a substituent, es u-eially halogen atul methyl. in the benzene nucleus in \\'llltll isatiu compounds the oxygen of the alpha-keto group is replaced by easily movable or re )laceable substitueuts. 1'. y. halogen, sulfur, t it amino group. the alkoxy group with -l-brotuolnu ihthol.

'l'he new dyes are in a dry state dark blue crvstullint mwders with a metallic luster which are soluble in hot. nitrolx-nzelugenerallv with a blue coloration. and which yield with lrvdrosullite and caustic soda .lye vats dyeing cotton after ex )(Htllt to air bhtc shades renutrkable for t \eir fastuess to chloriu.

lnorder to illustrate the new process more fully we can proceed as follows. the atria being by weight :-lt)tl parts of diin'oluoisatiu are converted in a dry benzene su pension into dibroumi at-in ehlorid by heating it with 72 parts l(-l, The mixture thus obtained is then poured into a solution which is well stirrml of parts of l-brontol-naphthol in dry benzene. 'lhe stirring is continued for a short time and the dye which separates on cooling is liltered oll' tllttl washed. it is a dark blue t-t' \'stalliue powder with a copper luster soluble in hotheuzeuo with a pure blue. and in eom-entratml sulfuric acid with a greenish blue coloration. lt vii-Ids with hydrosullite and .\'at)ll a yellow vat from which cotton is dyed yellow changing on ex msure to air into a fast clear blue fast; to c iloriu.

Instead of the above isatin derivative! othets may be used. c. y. chloro-, bromo-, chlorobrotuoor tlichloroisatiu chloritl, 0rthobromopara methylisatin ehloritl, tribrotuo -'lsatin ehloritl, para brotno orthona-t-hylisatin chloritl, ortho-para-tlimethylisatin chloritl, etc.

We claim 1. The herein described new dyestufla obtainable from a sulwtituted isatin derivative containing a snbstituent in the benzene nucleus in which cotuptmud. the oxygen of the ulplnt-keto groulli is replaced by an easily movable or rep aeeable subetituent'. and 4- brouto-l-uaphthol, which dyestutl'i! are in a dry state dark bltte crystalline powders with a metallic luster Wlllt'lln are soluble in hot nitrolx-tm-ne enerallv with a blue coloration. uutl which yield with hydroaultite and caustic soda lye vats dyeingeotton aftcr'exposture to air blue shades remarkable for their fastncss deserilml.

.2. The herein described new (l eetul 0btainable from dibromoisatin-alp -cltlorid and -l-ln-tmto-l-naphthol, which dyetltufl il in a dry state a dark blue crystalline wder with a copper luster, soluble in hot naene with a pure blue and in concentrated aulfurie acid with a greenish blue coloration. and which yields with hydrottulfite and caustic soda .lyc a yellow vat from which cotton is dyed yellow changing on ex mare to air into a clear blue remarkable II its fastuess to ehloriu, substantially as descrilxal.

In testimony whereof we have hereunto set our hands in the presence of two subscribing whitest-tea.

WILHELM ni'tuau. at ALFRED menu: a. s.'

Witness-s: ()1') KiiNttt,

Ctms. J. 'uuurr.

to chlorin, substantially as 

